Stator coil winding varnish impregnation equipment

Abstract

To provide a varnish impregnation device capable of applying varnish only to the coil winding portion of a stator.SOLUTION: A varnish impregnation device according to the present invention includes: a lower housing in which a stator is mounted, the stator including a plurality of teeth, a stator core, upper and lower insulators, and a coil winding; a lower sealing portion coupled to a lower part of an inner space of the stator in the lower housing; a central sealing portion installed on an upper part of the lower sealing portion; an upper sealing portion installed on an upper part of the central sealing portion; a first cover member coupled to an upper part of the upper sealing portion and an inner upper part of the upper insulator; and a second cover member coupled to an upper outer corner portion of the stator core and an outer periphery part of the upper insulator at a predetermined distance from a peripheral part of the first cover member. The lower housing has a plurality of varnish supply holes formed penetrating vertically through a lower surface thereof, and the plurality of varnish supply holes communicate with slots.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a varnish impregnation device for stator coil windings. More specifically, the present invention relates to a varnish impregnation device with a new structure that applies varnish to coil windings included in motor stators by vacuum impregnation, and that applies varnish only to the necessary parts of the object to be impregnated, thereby improving product quality and production efficiency. [Background technology]

[0002] A typical motor stator includes a stator core, upper and lower insulators coupled to the upper and lower parts of the stator core, and coil windings wound around the teeth. The coil windings are wound around the teeth and positioned in slots, which are spaces between the teeth.

[0003] Such motors are used in a variety of fields, including home appliances, automobiles, and robots. In particular, motors used in humid environments, such as refrigerator and air conditioner compressors, come into contact with fluids such as moisture in the coil winding. If the coil winding surface is not insulated, the moisture can cause a short circuit, which can lead to motor failure or fire. Therefore, to prevent product defects due to low insulation resistance in the coil winding, it is necessary to ensure that the coil winding surface has a certain level of insulation resistance.

[0004] One method for ensuring insulation resistance is to impregnate the stator in varnish and form a varnish coating on the surface of the coil winding. Japanese Patent Publication No. 60-77650 discloses a technique for applying varnish to the coil winding by impregnating the stator, which is the object to be impregnated, in a varnish impregnation solution. Japanese Patent Publication No. 06-36954 discloses a technique for applying varnish to the coil winding by loading varnish from above while transporting electrical components such as stators on a conveyor.

[0005] However, in these prior arts, the stator is immersed in a varnish impregnation liquid or the varnish is applied by dropping it from above the stator, so the varnish liquid remains on the inner and outer surfaces of the stator, along with the coil winding. Therefore, to improve the quality and performance of the motor, the varnish remaining on the inner and outer surfaces of the stator must be removed to ensure the inner and outer diameter dimensions of the stator core.

[0006] Furthermore, since a separate process is required to remove varnish remaining on the inner and outer surfaces of the stator, the motor manufacturing process for increasing the insulation resistance of the coil winding becomes complicated, which reduces productivity and may result in an increase in the manufacturing cost of the motor assembly. Also, since it is difficult to completely remove the varnish remaining on the inner and outer surfaces of the stator, there is a risk of a decrease in motor quality and a high defect rate.

[0007] Therefore, in order to solve the above-mentioned problems, the present invention proposes a varnish impregnation device with a new structure that supplies varnish to the coil winding and vacuum-impregnates it. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 6-36954 [Patent Document 2] Japanese Patent Application Publication No. 60-77650 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention provides a varnish impregnation device with a new structure that can apply varnish only to the coil winding portion excluding the inner and outer surfaces of the stator, thereby increasing the insulation resistance of the coil winding.

[0010] Another object of the present invention is to provide a varnish impregnation apparatus having a new structure which can improve productivity and reduce manufacturing costs.

[0011] The above and other inherent objects of the present invention can be easily achieved by the present invention described below. [Means for solving the problem]

[0012] The varnish impregnation device for a stator coil winding according to the present invention comprises a stator core (610) having a plurality of teeth formed to protrude inward or outward and slots (611) which are spaces between the teeth; upper and lower insulators (613) and (614) respectively coupled to the upper and lower parts of the stator core (610); a lower housing (110) in which a stator (600) including a coil winding (612) passing through the slots (611) and wound around the teeth is mounted in an internal space (112); a lower sealing part (120) coupled to the lower part of the internal space of the stator (600) mounted in the internal space (112) of the lower housing (110); The housing (110) includes a central sealing part (130) installed on the upper part of the lower sealing part (120), an upper sealing part (140) installed on the upper part of the central sealing part (130), a first cover member (150) coupled to the upper part of the upper sealing part (140) and the upper inner part of the upper insulator (613), and a second cover member (160) coupled to the upper outer corner part of the stator core (610) and the outer periphery part of the upper insulator (613) at a predetermined distance from the periphery of the first cover member (150), and the lower housing (110) has a plurality of varnish supply holes (111) formed by penetrating vertically on the lower surface, and the plurality of varnish supply holes (111) are connected to the slots (611).

[0013] In the present invention, it is preferable that a first packing member (P1) is installed between the upper part of the lower sealing part (120) and the lower part of the central sealing part (130) to seal the lower part of the inside of the stator core (610) of the stator (600) and prevent varnish from flowing into the lower part of the inner space of the stator core (610).

[0014] In the present invention, it is preferable that a second packing member (P2) is installed at the bottom of the upper sealing part (140) and at the top of the central sealing part (130) to seal the top of the inner space of the stator core (610) and prevent varnish (B) from flowing in from the top of the inner space of the stator core (610).

[0015] In the present invention, it is preferable that a pair of fixed supports (113) are formed on the outer wall of the lower housing (110) so as to protrude upward, a fastening portion (115) is connected to the fixed supports (113) by a hinge (114), the fastening portion (115) is rotatably connected by the hinge (114), and a bent portion (115A) bent at the top of the fastening portion (115) fastens and presses the first cover member (150) and the second cover member (160).

[0016] In the present invention, it is preferable that the rotor further includes a receiving member (116) installed on the bottom surface of the internal space (112) of the lower housing (110) and installed on the lower inner diameter portion of the lower insulator (614) of the stator (600).

[0017] In the present invention, it is preferable that a third packing member (P3) is installed between the lower inner diameter portion of the lower insulator (614) and the receiving member (116) to prevent varnish from flowing into the inside of the lower insulator (614).

[0018] In the present invention, it is preferable that a fourth packing member (P4) is installed around the outermost periphery of the bottom surface of the internal space portion (112) of the lower housing (110) to seal the outer diameter portion of the lower side of the lower insulator (614) and prevent varnish from flowing into the outer diameter portion of the lower part of the lower insulator (614).

[0019] In the present invention, it is preferable that a fifth packing member (P5) is installed around the lower surface of the first cover member (150) to seal the inner diameter portion of the upper part of the upper insulator (613) and prevent varnish from flowing from the upper part of the stator (600) to the inner surface.

[0020] In the present invention, it is preferable that a sixth packing member (P6) is installed on the lower surface of the second cover member (160) to seal the outer diameter portion of the upper part of the upper insulator (613) and prevent varnish from flowing from the upper part of the stator (600) to the outer surface. [Effects of the Invention]

[0021] The present invention increases the insulation resistance by mounting a stator in a varnish impregnation device placed inside a vacuum chamber, and then supplying varnish to the slots of the stator using a vacuum pressure method to impregnate the coil winding, thereby improving the insulation efficiency of the coil winding.

[0022] In addition, the present invention provides varnish by aligning the varnish supply holes in the lower housing of the varnish impregnation device with the slots in the stator, thereby enabling rapid varnish supply, shortening the time required to apply varnish to the coil winding and improving productivity.

[0023] In addition, in the present invention, varnish is not applied to the inner and outer surfaces of the stator other than the coil winding, so there is no change in the inner and outer diameter dimensions of the stator, which reduces the defective rate of stators and improves product quality.

[0024] In addition, since the varnish is applied only to the coil windings, excluding the inner and outer surfaces of the stator, the process of removing the varnish remaining around the inner and outer surfaces of the stator core is omitted, thereby shortening the manufacturing process and improving productivity, thereby reducing the manufacturing costs of the stator.

[0025] Furthermore, the present invention has the effect of reducing the amount of varnish consumed and cutting manufacturing costs, since the varnish is applied only to the coil windings placed in the slots of the stator by impregnation. [Brief explanation of the drawings]

[0026] [Figure 1]1 is a perspective view showing a varnish impregnation device according to the present invention; [Figure 2] 1 is a perspective view of a varnish impregnation device according to the present invention, seen from below. [Figure 3] 1 is an exploded perspective view of a varnish impregnation device according to the present invention; [Figure 4] 1 is a cross-sectional view of a varnish impregnation device according to the present invention; [Figure 5] FIG. 2 is a cross-sectional view showing the state in which the stator is separated from the varnish impregnation device according to the present invention. [Figure 6] FIG. 1 is a cross-sectional view showing a state in which a varnish impregnation device according to the present invention is installed in a vacuum chamber. [Figure 7] 1 is a conceptual diagram showing the process sequence of a method for varnish impregnation of a stator coil winding using a varnish impregnation device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing a varnish impregnation apparatus (100) according to the present invention, FIG. 2 is a perspective view of the varnish impregnation apparatus (100) according to the present invention seen from below, FIG. 3 is a perspective view showing an exploded view of the varnish impregnation apparatus (100) according to the present invention, FIG. 4 is a cross-sectional view of the varnish impregnation apparatus (100) according to the present invention, and FIG. 5 is a cross-sectional view showing the state in which the stator has been separated from the varnish impregnation apparatus according to the present invention.

[0028] As shown in Figures 1 to 5, the varnish impregnation device (100) according to the present invention comprises a lower housing (110), a lower sealing part (120), a central sealing part (130), an upper sealing part (140), a first cover member (150), and a second cover member (160), and is separably installed within a vacuum chamber (200).

[0029] The lower housing (110) has a cup shape with an open top and is mounted on the mounting portion (230) of the vacuum chamber (200). The stator (600) is mounted inside the lower housing (110). The lower housing (110) has a plurality of varnish supply holes (111) formed vertically through its bottom surface. The interior space of the lower housing (110) has an internal space (112) in which the stator (600) is mounted. A pair of fixed supports (113) protrude upward from the outer wall of the lower housing (110). The fixed supports (113) can be formed integrally with the lower housing (110) or can be connected to the lower housing (110) as separate members. A fastening portion (115) is connected to the fixed supports (113) via a hinge (114). The fastening part (115) is rotatably connected by the hinge (114), and the bent part (115A) bent at the top of the fastening part (115) functions to fasten and press the first and second cover members (150).

[0030] The stator (600) includes a stator core (610) having a plurality of teeth protruding inward or outward and slots (611) which are spaces between the teeth, upper and lower insulators (613) and (614) respectively coupled to the upper and lower parts of the stator core (610), and a coil winding (612) which passes through the slots (611) and is wound around the teeth.

[0031] The lower sealing portion (120) is connected to the lower portion of the inner space of the stator (600) mounted in the inner space portion (112) of the lower housing (110). The central sealing portion (130) is located on top of the lower sealing portion (120). A first packing member (P1) is installed between the upper portion of the lower sealing portion (120) and the lower portion of the central sealing portion (130). The first packing member (P1) seals the lower portion of the inner space of the stator core (610) of the stator (600) and prevents varnish from entering the lower portion of the inner space of the stator core (610). Although the lower sealing portion (120) and the central sealing portion (130) are described as separate components, they may be formed integrally. Furthermore, the lower sealing portion (120) and the central sealing portion (130) do not need to be firmly connected to the inner surface of the stator (600), and they do not need to be in contact with the inner surface. The lower part of the inner space of the stator core (610) is sealed by a first packing member (P1).

[0032] The upper sealing part 140 is installed above the central sealing part 130. A second packing member P2 is installed below the upper sealing part 140 and above the central sealing part 130 to seal the upper part of the inner space of the stator core 610 and prevent the varnish B from entering from the upper part of the inner space of the stator core 610.

[0033] The first cover member 150 is connected to the top of the upper sealing part 140 and the inner top of the upper insulator 613 to prevent the varnish B from flowing into the upper part of the inner space of the stator 600. The first cover member 150 and the upper sealing part 140 may be a single integrally formed member.

[0034] The second cover member 160 is connected to the upper outer corner of the stator core 610 and the outer periphery of the upper insulator 613 at a fixed interval from the periphery of the first cover member 150 to prevent the varnish B from flowing onto the upper outer surface of the stator 600. The second cover member 160 may be a single member connected to the first cover member 150 by a plurality of bridges (not shown) at fixed intervals.

[0035] The varnish impregnation device (100) according to the present invention has a structure in which a fastening portion (115) rotatably connected to a fixed support (113) of a lower housing (110) by a hinge (114) covers first and second cover members (150) and (160) with a stator (600) attached. A plurality of varnish supply holes (111) formed in the lower part of the lower housing (110) communicate with slots (611), which are spaces between the teeth of the stator core (610). Coil windings (612) are located in the slots (611). Varnish (B) is supplied from the bottom of the varnish supply holes (111) and moves upward through the slots (611) to impregnate the coil windings (612) up to their upper parts.

[0036] The receiving member 116 is installed on the bottom surface of the internal space 112 of the lower housing 110, and is also installed on the lower inner diameter portion of the lower insulator 614 of the stator 600. A third packing member P3 is installed between the lower inner diameter portion of the lower insulator 614 and the receiving member 116 to prevent varnish from flowing into the interior of the lower insulator 614.

[0037] A fourth packing member (P4) is installed around the outermost periphery of the bottom surface of the inner space (112) of the lower housing (110) to seal the outer diameter of the lower side of the lower insulator (614), thereby preventing varnish from entering the outer surface of the lower part of the lower insulator (614).

[0038] A fifth packing member (P5) is installed around the lower surface of the first cover member (150). The fifth packing member (P5) seals the inner diameter of the upper part of the upper insulator (613) to prevent varnish from flowing from the top of the stator (600) to the inner surface.

[0039] A sixth packing member (P6) is installed on the lower surface of the second cover member (160). The sixth packing member (P6) seals the outer diameter portion of the upper part of the upper insulator (613) to prevent varnish from flowing from the upper part of the stator (600) to the outer surface.

[0040] Figure 6 is a cross-sectional view showing the varnish impregnation device (100) of the present invention installed in a vacuum chamber (200). Referring to Figure 6, the varnish impregnation device (100) of the present invention is installed in a groove-shaped mounting portion (230) formed on the bottom of a cup-shaped vacuum chamber (200) with an open top. A vacuum lid (220) is installed on the top of the vacuum chamber (200) to seal the interior space of the vacuum chamber (200). An air passage (210) is installed on the side of the vacuum chamber (200) to exhaust air from inside the vacuum chamber (200) to the outside to create a vacuum, or conversely, to allow outside air to flow into the vacuum chamber (200) when the inside of the vacuum chamber (200) is already in a vacuum state, creating equilibrium with the external air pressure.

[0041] A varnish supply passage 231 is formed in the center of the mounting portion 230, which communicates with a varnish supply hole 111 formed in the lower housing 110 of the varnish impregnation device 100. The varnish supply passage 231 is connected to a pipe 300 through which the varnish B is supplied. The vacuum chamber 200 can be installed on a support frame 700, which has a connection hole 710 through which the pipe 300 passes.

[0042] As described above, in the present invention, the central sealing part (130), the lower sealing part (120), and the upper sealing part (140) can be integrally formed into a single member. The first cover member (150) and the second cover member (160) can also be integrally formed into a single member. The first through sixth packing members (P1-P6) of the present invention can be made of rubber, but are not limited thereto and can be made of various materials such as silicone and flexible resin.

[0043] Although the present invention has been described in terms of a single varnish impregnation device (100) installed in a vacuum chamber (200), multiple varnish impregnation devices (100) may be installed within a single vacuum chamber (200). A plate (not shown) may also be used to install multiple varnish impregnation devices (100). In this case, the plate must be formed with passages that communicate with each varnish impregnation device (100) and allow varnish (B) to be supplied through pipes (300).

[0044] Figure 7 is a conceptual diagram showing the process sequence of a method for varnish-impregnating a stator coil winding using a varnish-impregnation apparatus (100) according to the present invention. As shown in Figure 7, the varnish-impregnation apparatus (100) according to the present invention is installed in a vacuum chamber (200). The vacuum chamber (200) is connected to a varnish storage tank (400) storing varnish (B) via a pipe (300). A valve (V) is installed in the pipe (300) to control the supply of varnish (B) from the varnish storage tank (400) to the vacuum chamber (200). An air pump (500) is connected to an air passage (210) formed in the vacuum chamber (200) to evacuate the air inside the vacuum chamber (200) or to supply external air into the vacuum chamber (200).

[0045] The method of varnish-impregnating a stator according to the present invention includes the first step of mounting a stator (600) in a varnish-impregnation device (100) installed in a vacuum chamber (200) as shown in Figure 7(a) and discharging the air inside the vacuum chamber (200) to the outside using an air pump (500) to maintain the inside of the vacuum chamber (200) in a vacuum state.

[0046] In the second step, as shown in Figure 7(b), the valve (V) connected to the middle of the pipe (300) in the first step is opened to inject the varnish (B) stored in the varnish storage tank (400) into the slot (611) of the stator core (610) through the varnish supply hole (111) formed in the lower housing (110) of the varnish impregnation device (100).

[0047] When varnish (B) is injected into the slots (611) of the stator core (610) in this vacuum state, the varnish (B) does not penetrate the inner and outer surfaces of the stator core (610), so the varnish (B) penetrates and is applied only to the inside of the slots (611) and the coil windings (612), and is not applied to the inner and outer surfaces of the stator core (610).

[0048] In the next third step, as shown in Figure 7(c), the air pressure inside the vacuum chamber (200) is brought to equilibrium with the external air pressure in the second step through the air pump (500) or by natural air inflow using the internal / external pressure difference. Then, the valve (V) is opened and the air pump (500) is operated to apply positive pressure, discharging the varnish (B) from the vacuum chamber (200) and transferring it back to the varnish storage tank (400).

[0049] In the next fourth step, as shown in FIG. 7(d), once the varnish (B) has been completely discharged from the vacuum chamber (200) in the third step, the valve (V) is closed and the operation of the air pump (500) is stopped.

[0050] In the next fifth step, as shown in FIG. 7(e), the vacuum lid (220) of the vacuum chamber (200) is opened, and the stator (600) attached to the varnish impregnation device (100) is separated from the varnish impregnation device (100), and then pulled out of the vacuum chamber (200) and transferred to the curing device (800) to cure the varnish (B) applied to the coil winding (612).

[0051] As described above, the method for impregnating a stator coil winding with varnish according to the present invention can prevent defects due to dimensional deformation caused by the application of varnish (B) to the inner and outer surfaces of the stator 600. Furthermore, a separate process for removing varnish (B) can be omitted, improving the productivity of the stator 600 and reducing the consumption of varnish (B), thereby reducing the manufacturing cost of the stator 600.

[0052] The detailed description of the present invention as set forth above is merely an example for the purpose of understanding the present invention, and is not intended to define the scope of the present invention, which is defined by the following claims, and it is understood that any simple modifications or variations of the present invention within this scope are also included in the scope of the present invention. [Explanation of symbols]

[0053] 100 Varnish impregnation device 110 Internal space 111 Varnish Supply Hall 112 Central recess 113 Fixed support stand 114 Hinge 115 Fastening part 115A Bend part 116 Receiving member 120 Lower sealing part 130 Central sealing section 140 Upper sealing section 150 first cover member 160 second cover member 200 vacuum chamber 210 Air passage 220 Vacuum lid 230 Mounting part 231 Varnish supply passage 300 Pipes 400 Varnish storage tank 500 air pump 600 Stator 610 stator core 611 Slots 612 Coil Winding 613 Upper insulator 614 Lower insulator 700 Support Frame 710 Connection Hole 800 curing equipment B Varnish V-valve P1 to P6 First to sixth packing members

Claims

1. a stator core (610) having a plurality of teeth formed to protrude inward or outward and slots (611) which are spaces between the teeth; upper and lower insulators (613) and (614) respectively coupled to the upper and lower parts of the stator core (610); and a coil winding (612) passing through the slots (611) and wound around the teeth; and a lower housing (110) in which a stator (600) is mounted in an internal space (112); a lower sealing part (120) coupled to the lower part of the inner space of the stator (600) mounted in the inner space part (112) of the lower housing (110); a central sealing part (130) installed above the lower sealing part (120); an upper sealing part (140) installed on the upper part of the central sealing part (130); a first cover member (150) coupled to an upper portion of the upper sealing portion (140) and an inner upper portion of the upper insulator (613); a second cover member (160) coupled to an upper outer corner portion of the stator core (610) and an outer peripheral portion of the upper insulator (613) at a predetermined interval from the peripheral portion of the first cover member (150); wherein the lower housing (110) has a plurality of varnish supply holes (111) formed by being penetrated vertically on the lower surface, and the plurality of varnish supply holes (111) are in communication with the slots (611).

2. 2. The varnish impregnation device for a stator coil winding according to claim 1, wherein a first packing member (P1) is installed between the upper part of the lower sealing part (120) and the lower part of the central sealing part (130) to seal the lower part of the inside of the stator core (610) of the stator (600) and prevent varnish from flowing into the lower part of the inner space of the stator core (610).

3. 2. The varnish impregnation device for a stator coil winding according to claim 1, wherein a second packing member (P2) is installed at the bottom of the upper sealing portion (140) and at the top of the central sealing portion (130) to seal the top of the inner space of the stator core (610) and prevent varnish (B) from flowing in from the top of the inner space of the stator core (610).

4. 2. The varnish impregnation device for a stator coil winding according to claim 1, wherein a pair of fixed supports (113) are formed protruding upward from the outer wall of the lower housing (110), a fastening portion (115) is connected to the fixed supports (113) by hinges (114), the fastening portion (115) is rotatably connected by the hinges (114), and a bent portion (115A) bent at the top of the fastening portion (115) fastens and presses the first cover member (150) and the second cover member (160).

5. 2. The varnish impregnation device for a stator coil winding according to claim 1, further comprising a receiving member (116) installed on the bottom surface of the internal space (112) of the lower housing (110) and installed on the lower inner diameter portion of the lower insulator (614) of the stator (600).

6. 6. The varnish impregnation device for a stator coil winding as claimed in claim 5, wherein a third packing member (P3) is installed between the lower inner diameter portion of the lower insulator (614) and the receiving member (116) to prevent varnish from flowing into the interior of the lower insulator (614).

7. 2. The varnish impregnation device for a stator coil winding as claimed in claim 1, wherein a fourth packing member (P4) is installed around the outermost periphery of the bottom surface of the internal space portion (112) of the lower housing (110) to seal the outer diameter portion of the lower side of the lower insulator (614) and prevent varnish from flowing into the outer diameter surface portion of the lower side of the lower insulator (614).

8. 2. The varnish impregnation device for a stator coil winding according to claim 1, wherein a fifth packing member (P5) is installed around the lower surface of the first cover member (150) to seal the inner diameter portion of the upper portion of the upper insulator (613) and prevent varnish from flowing from the upper portion of the stator (600) to the inner surface.

9. 2. The varnish impregnation device for a stator coil winding according to claim 1, wherein a sixth packing member (P6) is installed on the lower surface of the second cover member (160) to seal the outer diameter portion of the upper part of the upper insulator (613) and prevent varnish from flowing from the upper part of the stator (600) to the outer surface.

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